April fools\' occurs first day of fourth month

Ordinarily all manner of tomfoolery doth abound
celebrated for countless centuries
by different cultures
though exact origins remain
shrouded in mystery,
nevertheless quasi holiday of sorts
begat courtesy primitive precursor
to Central Intelligence Agency
nsync with Federal Bureau of Investigations
equivalent to Fred Flintstones
as spymasters forebears
dubbed secret double agent
linkedin to Bedrock background
check, where court jester donned
as most important person and crowned
accordingly prevaricating
without suffering any retribution
saying the unpopular king drowned.